Re: debuggin types in records

My favorite type-debugging  trick is the following

fun hole () = raise (Fail  "place holder")
 
than I start replacing expressions with hole() until the type error goes 
away. Once, I find the expression that makes the problem go away I at 
least know what to blame.

brian wrote:
> I ran across the rather self-explanatory error
>
>    operator domain: XEventTypes.key_xevtinfo
>    operand:         {child:word, event:word, event_pt:Geometry.point,
>                      keycode:int, mbut_state:XProtTypes.mbutton_state,
>                      mod_state:XProtTypes.modkey_state, root:word,
>                      root_pt:Geometry.point, same_screen:bool,
>                      time:Word32.word}
>
> The problem is that I _think_ the error is due to the fact that I've  
> got the type of one of the entries wrong.  Naturally I think I've got  
> it right, and clearly I am wrong  :-)
>
> Is there some way to turn up some debugging flags so I would know  
> which one ?
>
> Any good stratgey for figuring this out ?
>
>   

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